Nail cutting machine



Sept. 9, 1952 R. w. BRADLEY NAIL CUTTING MACHINE 2 SHEETS-SHEET 1 Filed Aug. 24, 1951 Invemar Robert WBradley B is Attorney Sept. 9, 1952 R. w. BRADLEY 5 NAIL cu'rwmc MACHINE Filed Aug. 24, 1951 2 SHEETS-SHEET 2 mai umum illllllil: 3 n

fiwelgzor Robe/t WB radley Patented Sept. 9, 1 952 i nobe r name to o nea'sl d" meme, :N J.

' Marbleliead I i i-ffcoi iioration; Flm 1 corhorationhf mew- Jersey "assignor Th n e fq i 161 26 tbI ia 'fii t i m i andi's herein i 11ustrated asefmbdi v I chine for cutting on upstandingportion's 'of'- nai ls or tacks in the insoles of'shoes, p

n inaflm nees n she's i fr uent y s peristhat the-nails extend through the insole and project abote it forming a *hazard to'fla person putting onthe 'shde. Itis an 'bj ect of this-infvention "to "provide a -maohi c parjative'ly simple in construction whichiseffective to out 01f such nails substantially flush with-{the insole in su'cnma nner that they" will 'no' longer form-obje'etioha-hlefibstruct ""To th d v vention provides a nailciitting machine in ivhic'h thr 'is-aii elongated sleevetr "ating a't oi'i end inn-"fixed cutting blade, nuiemeuma withihthe em-"and hav ng at "one end 'ain'ovablecutting blade adjacent'td the end ofthe sleeve and angularly spaced from the fixedblafie', there being power'means for'actuating th spindle in a direction tdforce'the" movablebladetowaid the 'fi'xe'd blade in acutting operation, and a spring' for" returning the movable blade in the opposite direction into inoperative position. The mounting of the cutting blades at th'eend of an elongated sleeve facilitates presentation 'of' a shoe in operative relation t'o'th' blades and'by moving the shoealong 'the end of'the sleeve upstanding nails to be out off can readily be located in the space between the blades. Preferably, and as shown,-the' power means for actuating-the spindle is 'a' solenoid operable by a pulse of 'ele'etriccurrent and'which- -is effective 'to apply the peak poweravailable'to the spindledurin'g' the cutting operation with the-result that a "nail located between the blades is cleanlycut oifat the upper surface of the insolein such'rnannerthatho further treatment ofthenail suchasby burnishing is required.

These and other'features 'of the inventionare disclosed in the following specification and in the ana "sherei illiistrated; the ;in-'

se e Joe-8 '5 accompanying drawings. and-are point'ed'outin The machine is" desiened: "for operj ation upon shoes'snch ass-hoe '6', Fig. 3, having an e fl.

throi' gh which pro ect 6nd portions ar-p er a,- ben t e Quitie i taching nails '8, v d {I meme fevi di o s v r e fi 'stant'ially flush "with the uppersur iaoe of 1 sole.

illustrated in Fig. 1 the blades- Illl'2 are carried at the'l'ower endofjan v c le ds'se in i em-e eni n y" u n rted by a bra ke '1? $9.1 an a m 1 .4 1 f f e- ;8.Fies- 1251151 iiim Withthe sleeve "attire d the outweiidlyffrom thefsleeve,. and iace 2' n; clined' to the vertical and horizontal cutting edge 24, Fig. 2.

Thefblade |2 which'is the move; eflblade, is integral with the lower eflndbf'a sp 1,e-' 2e, ,'r 1;e bl rejects outwards; offthefspihdle, mines an inc med face zatermmating in 'a} l'iorizoiital cutting edge 30'.

The spindle n is assembled within'the sleeve I14 With'th aces of the blades jdispeses teward each other andtheircuttingedges'inalinnint as shown in Fig. '3, 3 the blade "[2" extending out of the sleeve through an arciiate opening 3 2 Thisfopening is of stiffiient width as to permit angular movement df abo ut 25-, of the s "mile and blade, the movement being limited hy mterengagement of the cutting edges of the lgl'ades in one direction and by engagement of-the back of the Blade 12 with the-wall of the opening in the other direction. -Axial moveinent of the spindle in the sleeve'isprevented by a retaining n MI -fi s w ch nte a o e n a t upper end oi the spindle ahdbears-against a an Q ih eeve.

' The sleeve l4 withthe spindle--26- positioned ith? is ure x o h ca 'bYrSQ WM" Whichextendthrough the flangev38 on th e sleeve 93 hi9 a 5 4? debend s from t as n v The upper-end ofthespind-le '26 is--slabb,ed:-ofi forming a key-44 which extends upwardly-through a boreqfi intheboss ll-and into--a-sl;ot 48in*a shaft-50 which forms part of mechanism for oscillatingthe blade l2,

This mechanismincludes a rotary solenoid' of any suitable construction such as can-be-purchased on the market. One form of rotary solenoid is illustrated inFig-s. 2 and=4fand comprises an armature 52 positioned within a-coil54 normally, located within a sleeve 56. The armature carries the shaft 40 which extends downwardly through an opening 58 in the sleeve 56 which is secured to the casing l6 by screws 60, the upper end of the sleeve being closed by a cap 62.

The armature 52 is supported by a plate 64 loosely surrounding the armature and fixed within the sleeve 56 and having downwardly inclined recesses 66 along its periphery for receiving ball bearings 68 which project above the plate 64 into upwardly inclined recesses 10 in a plate 12 secured to the armature. This construction is such thatwhen the coil 54 is energized the armature is pulled downwardly and under the cam action of the ball bearings 63 and recesses 66 and 10 the armature is rotated in a clockwise direction, Fig. 4, effecting angular movement of the spindle 25 by means of the key and slot connection 44, 48 thus to move the blade I2 into engagement with the fixed blade l0.

Mechanism is provided for returning the blade 12 to inoperative position after a cutting operation. This is accomplished by a coil spring 12 mounted within depending projections 14 on a plate '16 below the coil 54. The spring surrounds the shaft 50 and has one end engaged in a recess 13 in the shaft and the other end embracing one ofthe projections 74. Thus after the coil is deenergized the spring 72 is effective to rotate the shaft in a contraclockwise direction, Fig; 4,.effecting a return of the blade [2 to a position at the far side of the recess 32.

In order to improve the cutting action of the blades, use is made of an inertia weight 80 which is secured to the upper end of the armature 52. This weight serves to store up energy during the initial rotative movement of the armature and such energy is applied when it is most needed during the actual cutting operation to force the blades through a nail.

The solenoid is energized by direct current from a rectifier 82, Fig. 4, supplied with alternating current from power lines 84 through a time controlled relay 85. The relay is operated by a circuit 81, from the power lines 84, including a solenoid 88, a timer 90, in this instance a tungsten filament bulb, and a switch 92 in series.

The circuit to the rectifier is normally held open by spring 94 which holds the relay up. However, when the switch 92 is closed the coil 88 is energized closing the relay and passing current to the rectifier. As the tungsten bulb heats up the resistance in its circuit increases until the spring 94 overcomes the pull of the solenoid and the circuit through the relay is broken. This circuit operates to prevent overloading of the solenoid and makes it feasible to use a smaller solenoid than would otherwise be the case.

By utilizing a pulsed current the solenoid is supplied with high peaked power and the torque on the spindle 25 and, consequently, on the movable blade l2, is substantially constant during the cutting operation of the blade.

The -machine is provided with a transparent plastic guard 96 supported by a bracket 98 carried by the arm 20. The guard extends horizontally in a plane somewhat below the casing 16 and has an opening I09 through which the sleeve M passes. The guard permits a clear View of the Work presented to the cutting blades while, at the same time, prevents cut pieces of nails from flying into the face of an operator.

The bracket 98 also carries a lamp I92 which extends through an opening I O4 in the guard into position to illuminate the work.

In the operation of the machine a shoe 6, Fig.

4 3, is brought up against the lower end of the sleeve M with the sleeve positioned in the heel portion of the shoe and the latter is shifted until an upstanding nail is located between the blades Hi and i2, and preferably, against the fixed blade it. Actuation of the switch 92 causes operation of the solenoid 54 as above set forth with the result that the nail is severed by the action of the cooperating blades. f Q

While the invention is primarily concerned with the cutting off of the ends of heel attaching nails projecting above the insole of a shoe it is contemplated that the machine described is adapted to use in cutting other nails or tacks suchas lasting tacks which are sometimes present in lasted shoes.

' Having thus described my invention what I claim as new and desire to secure by Letters Patent of the United States is:

1. A nail cutting machine comprising an elongated sleeve, a fixed cutting blade secured to one end of the sleeve and projecting outwardly therefrom, a spindle rotatably mounted in the sleeve, the sleeve having an arcuate opening in the end thereof adjacent to the fixed blade, a movable blade secured to the spindle and projecting outwardly through the opening, power means for moving the spindle angularly in a direction to cause engagement of the blades, and a spring to effect movement of the movable blade in the op- Posite direction. 7

2. A nail cutting machine comprising an elongated sleeve, a fixed cutting blade secured to one end of the sleeve, 2. spindle rotatably mounted within the sleeve, a cutting blade carried by the spindle in alinement with the fixed blade, power means for moving the spindle angularly in a direction to cause engagement of the blades, and a spring for moving the spindl in the opposite direction.

3. A nail cutting machine comprising an elongated sleeve having at one end a fixed cutting blade, a spindle mounted in the sleeve and having at its one end a movable cutting blade in lateral alinement with the fixed blade, a solenoid for rotating the movable blade in a direction toward the fixed blade and a spring for rotating the movable blade in the opposite direction.

4. A nail cutting machine comprising a vertically extending support terminating in a fixed cutting blade, a movable blade in lateral alinement with the fixed blade and mounted for movement about the axis of the support, a solenoid for efiecting movement of the movable blade from an inoperative position into engagement with the fixed blade, and a spring for returning the movable blade to inoperative position.

5. A nail cutting machine comprising a vertically extending member terminating in a fixed cutting blade, a movable cutting blade cooperable with the fixed blade for cutting nails projecting from the insoles of shoes, means for mounting the movable blade for oscillation relatively to the fixed blade, a rotary solenoid having an armature for forcing the movable blade in a direction toward the fixed blade, a spring for returning themovable blade to inoperative position, and, an inertia weight secured to the armature of the solenoid.

ROBERT W. BRADLEY.

No references cited. 

